Difference between pages "r7.1.1:Macro LFDS711 LIST ASU GET VALUE FROM ELEMENT" and "r7.1.1:Macro LFDS711 LIST ASU SET KEY IN ELEMENT"
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{{DISPLAYTITLE:macro | {{DISPLAYTITLE:macro LFDS711_LIST_ASU_SET_KEY_IN_ELEMENT}} | ||
==Source File== | ==Source File== | ||
└───liblfds711 | └───liblfds711 | ||
| Line 10: | Line 10: | ||
==Macro== | ==Macro== | ||
#define | #define LFDS711_LIST_ASU_SET_KEY_IN_ELEMENT( list_asu_element, new_key ) | ||
==Parameters== | ==Parameters== | ||
''list_asu_element'' | ''list_asu_element'' | ||
: A ''struct lfds711_list_asu_element''. Not a pointer to it - the struct itself. | : A ''struct lfds711_list_asu_element''. Not a pointer to it - the struct itself. | ||
''new_key'' | |||
: A void pointer, which the key in ''list_asu_element'' is set to. | |||
==Return Value== | ==Return Value== | ||
No return value. | |||
==Notes== | ==Notes== | ||
As with all ''liblfds'' macros, the macro operates on the structure itself, not a pointer to it. | As with all ''liblfds'' macros, the macro operates on the structure itself, not a pointer to it. | ||
The | The key can only be set before an element enters the list. If it is set after, the list will likely be broken (as the new key, being different to the old key, would most likely require the element to be in a different position in the tree, and this element movement is not supported) and also, key is not set atomically, so that even if a change was made, there is in principle no guarantee any other logical core would see that change anyway. | ||
Key is not set atomically because it is known it will only be set before an element enters the tree. Matters can be (and have been) arranged to ensure key is despite the lack of an atomic set correctly propagated to other logical cores, but this is a behaviour of the linking code, not of the macro which sets key. | |||
==Example== | ==Example== | ||
Latest revision as of 18:12, 16 February 2017
Source File
└───liblfds711
└───inc
└───liblfds711
lfds711_list_addonly_singlylinked_unordered.h
Opaque Structures
struct lfds711_list_asu_element;
Macro
#define LFDS711_LIST_ASU_SET_KEY_IN_ELEMENT( list_asu_element, new_key )
Parameters
list_asu_element
- A struct lfds711_list_asu_element. Not a pointer to it - the struct itself.
new_key
- A void pointer, which the key in list_asu_element is set to.
Return Value
No return value.
Notes
As with all liblfds macros, the macro operates on the structure itself, not a pointer to it.
The key can only be set before an element enters the list. If it is set after, the list will likely be broken (as the new key, being different to the old key, would most likely require the element to be in a different position in the tree, and this element movement is not supported) and also, key is not set atomically, so that even if a change was made, there is in principle no guarantee any other logical core would see that change anyway.
Key is not set atomically because it is known it will only be set before an element enters the tree. Matters can be (and have been) arranged to ensure key is despite the lack of an atomic set correctly propagated to other logical cores, but this is a behaviour of the linking code, not of the macro which sets key.